I like to lurk in SVT mod section (not an SVT owner) to hear the SVT crowd come up with some great ideas. That being said, this shouldn't be too much of an undertaking. I would start with going to an auto upholstery shop; they can help you with the seat heaters. Beyond that the wiring and switches shouldn't be too big of an issue. My biggest curiosity would be where you mount the switch for heater control; in the front for owner/driver control or in the rear for the people that are using the seat.